Screening apparatus



F. D. RUPRECHT.

SCREENING APPARATUS.

APPLICATION FILED JUNE5, 1919.

1,397,906. P tented Nov. 22, 1921.

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SCREENING APPARATUS.

APPLICATION FILED JUNES, 1919.

1,397,906. Patented Nov. 22, 1921.

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UNITED STATES PATENT OFFICE.

FRANK D. RUPRECHT,

OI IIDWAY, FLORIDA.

SCBEENIN G APPARATUS.

Application filed June 5,

- theaccompanying drawings.

The aim of this invention, generally stated, is to provide an efiicient, reliable and durable screening apparatus for sifting Fullers earth, cement, etc., or in fact any material that requires screening, in an expeditious and satisfactory manner, and the operation of which is not affected by the presence of dust and rit.

More specific 0 jects attained through the pursuance of my invention in any of its various forms illustrated in the accompanying drawings are: ease of action of the screen; simplicity of construction of the screen supportmgmeans and their -practical immunity from wear; positiveness of operation of the vibratin means; and freedom of the screen from c ogging.

The lastv mentioned object is realized throu h the employment of flexible elements stretc ed beneath the screen which are slackened when the screen moves in one direction and are jerked taut when it moves in the gpposite direction, thereby to impart a quick ow to the screen surface and vibrate it in 'a direction at right angles to the plane of the screen so that any particle can ht within the meshes of the screen are e ectually dislod ed.

(l bjects in addition to those above enumerated will become apparent as this description proceeds, and with these several objects in view, the invention may be defined as consisting of the combinations of elements set forth in the claims annexed hereto and illustrated in the accompanying drawings to which reference is now made.

Figure 1 is a side elevation, and Fig. 2 a plan view of my improved screening apparatus, parts being broken away in each view to reveal certain structural details, the former figure. including adiagram of the electric circuits involved: Fig. 3 is a fragmentary end elevation of the apparatus as viewed from line 3-3 of Fig. 1; Fig. 4 is a plan view of the supporting and vibrating means situated adjacent one end of the screen shown in Figs. 1 and 2; Fig. 5 is a Specification of Letters Patent.

Patented Nov. 22,1921. 1919. Serial No. 301,961.

perspective view of the means shown in plan in Fig. 4; Fig. 6 is a fragmentary perspect1ve view of the screen showing one of the bearing elements which is adapted to rest upon the bearing portion of the supporting means of Fig. 5; Figs. 7 and 8 are views similar to Figs. 3 and 4, of a modification of the supporting and vibrating means; Fig. 9 1s a side elevational view of a screening apparatus incorporating a further modification of the supporting and vibrating means,.

and Fig. 10 shows such modification in lan; Fig. '11 is a plan view of another mo ificat1on of the screen supporting and vibrating means; Fig. 12 is a transverse section through a screening apparatus involving the modification of Fig. 11; and Fig. 13 is a sectional detail through the connection between one of the bearing elements of the screen and the cooperating part of the supporting means involved in the last modification.

While I shall now proceed to describe in detail and by the-use of reference characters the constructions illustrated in the accompanying drawings, I wish to be understood as not limiting myself to the structural details thereof further than is required by the terms of the accompanying claims.

In the drawings, 1 is a supporting structure which may be of any approved form, the same involving cross members 2 and 3 situated, respectively, at its upper and lower ends. A beam 5 *is' hingedly connected, through a strap 6 of flexible material, such as steel, to the upper cross member 2 of the supporting structure; and the lower end of the beam is adapted to be spaced and supported from the lower cross member 3 by means of a T-headed bolt 8 which passes freely through a hole in said member 3 and is adapted to be held in any adjusted position in the hole by nuts 9 that are arran ed to be engaged with the upper and un erneath surfaces of the cross member. The ends of the T-head of bolt 8 occupy apertures in a yoke 10 which embraces beam 5 and is secured thereto in any suitable manner. Thus by adjusting bolt 8, the beam 5 may be swung to and held at any angle desired for altering the angular disposition of the screen which, as I shall presently explain, is supported from the beam.

Situated near the upper and lower ends of beam 5 are identical screen supportin and vibrating means, the one reversed wit respect to the other, as is apparent from Fig.

1. Each of these means consists ofabase l V 12 having a standard 13 to which is attached a transversely disposed spring 14. L-shaped.

plates 15 are secured to the opposite. end

portions. of thespring, and the inner ends of the plates are arranged parallel to each other and constitute armatures 16 of electromagnets 17 that are supported in operative relation to the armatures by frames 18 that rise from base 12. A It will. be readily understood that upon the simultaneous energization of the opposed magnets 17 'to attract their armatures 16, the ends of the plates andto the underneath surface of this frame is applied .the screen" proper, designated 24,

L3 To each end of each of the side members 21 is applieda bearing element 25 which is in 0 olinedadownwardly and outwardly from the screenandathe inner inclined face of which is provided'with all-shaped groove 26'adaptw ed to receive what l may term,- by' reason of its nature, the knife edge bearing portion 28 of the corresponding plate 15. This construction. provides a very simple. durable, and free acting connection between the (a screen and supporting means, and from the foregoing :description it will be readily seen that when: theplates '15 are swung or vibrated Sby the; intermittent energization of the magnets .17, the screen'20 will be re-- Mciprocated in short? strokes-according to the extent of'swingof the plates-=15 and with a frequency correspondlngito that of the f impulses-of current directed through the magnets 17.. t l With' the screen vibrating-as explained,

material to be sifted maybe precipitated through suitable means not shown) .onto the upperv end of the screen and as it-cascades' 1-; i finer particles will pass. throughv the screen and fallupon an inclinedtrough 30, that is shown assu-pported byithe-structure 1,-and

be;conducted thereby to a: suitable receiver,

I such being indicated at31. in Fig. 1. i The- +11% t,taili ngs-, particles. too large to ass through th'elgmeshes of the screen, wil be discharged fromfithe lower end of the screen intoa hopper 32 orother suitable receptacle.- In such an; operation of the screen a certain 'lfamountz of the material becomes. caught within its meshes, and-this would greatly impair the efficiency. of the screen were beyond springs and cords.

v designated generally by=thenumeral20, consists of a frame made 25 up of side members 21 and cross braces 22, 'jerked more or less'vlolently with theresult circuit through an-conductor 40, brushes 4].

vbrushes46contained within a line 47 from screen-in a direction at right angles to its normal movement, and to accomplish this end I extend a series of flexible elements or cords 35 lengthwise beneath the screen, attaching their lower ends to the screen frame, as indicated in Figs. 1 and 6, and their-upperends through springs 36, to eye bolts 37 which pass through a bar 38 shown as carried by the upper end of beam 5, and which bar I apply nuts 39 to the bolt for the obvious the tension of-the he springs 36 com ensate for any variations in the len th 0 the cords due to changes in atmosp eric con- I ditions and absorb the shock that would otherwise be imparted to the cords when they are jerkedtaut and thus prevent their breaking. When'the screen 20 moves upwardly, the cords-35 are slackened, and when it swings to its lower position the, cords areprotruding ends of the purpose of 1v adjustin 80 in the-opposite direction, itmay bef ound advantageous in sometinstancesto1-employa two reversely disposedvibrating means, as illustrated in Fig. a1, so as to make the movement of the screen positive in both directions. j 3 Under this duo'arrangementan interrupter is included in the circuits to the magnets ener ize them. Referring to the diagram of ig. 1, current is :directed from what I off-the two setswhich "acts to' alternately have indicated as the positive side of the '(when bridged by contact plate 42 on a drum; 43), conductor 44, the magnets" of the down; the inclined surface of the screen, the

lower set, and conductor 45 tov the negativesideof the'circuit. Intermediary its times of contact with brushes 41,-p1ate 42 bridges thepositive side of-the circuit to the magnets of the upper set, the current returning to.

the jnegative side of the circuit through vcon- -ductor-48. As a matter of illustration, Iv .have shown drum 43 as driven through vgears-50 and 51v from a motor'52 having itsi terminals connected to the positive a negative'sides of the -.circuit through the ire-- spectlve wires 53' and 54. As--:the motor.

drives the drum .43, first one andthen the other of the sets of magnets will be energized to positively move screen 20 alternately in opposite directions.

the ends of the In the modification of Figs. 7 and 8, a single magnet 17 for the two magnets of the previous form, and the same is supported within a U-frame 18 from the base 12*. When the magnet 17 a is engergized, the armatures 16 which constitutes parts of plates 15 are moved inward to reflect the spring 14 screen 20, as the same was swung in the former modification when magnets 17 were energized.

In Figs. 9 and 10, the parts of the general structure corresponding to those of the structure revealed in Figs; 1 to 6 are designated by the same reference numerals augmented by the exponent b. In the present form of supporting and vibrating means, a spring 55 is supported within the upper end of a standard 56 which rises from a base 57 applied to beam 5 near its upper end, and bearing members 58 having their outer ends formed similar to the outer end of the former plates 15, are arranged forcoiiperation with the bearing element 25 of the screen 20. boss 61 of standard 56, and the branches of the lever pass beneath spring 55 and-then upwardly and backwardly to engage the side of the spring opposite that whereon the lever is pivoted. The stem of the lever has an armature bar 63 attached to it which overhangs electro-magnet 64 supported by base 57. As these magnets are energized to attract the armature bar 63, the lever 60 is rocked to deflect spring 55 and move the screen in one direction and the relaxation of the spring, due to the deenergization of the magnets, ermits the screen to swing in the opposite direction. The lower end of the screen is shown as supported in substantially the same manner as its upper end by a spring 66 supported in a standard 67 which rises from a base 68 that is applied to the lower end of beam 5*. -Vibrating means is not shown as used in connection with this supporting means, although it is obvious that such might be done, and that it might be reversed to the upper end so that the same effect would be realized here as that accomplished through the arrangement illustrated in Fig. 1.

In the form of my supporting and vibrating means illustrated in Figs. 11 to 13, the base 70 of a standard 71 is applied to beam 5, and a spring 72 is supported in a transverse position by the standard. In this case, spring 7 2 extend out beneath the sides of the spring frame where socket members 73 are applied to them. As illustrated in detail in Fig. 13, a ball 74 occupies the bottom of each socket and receives the downward thrust of a gudgeon 75 which is shown as substituted.

and swing the A Y-shaped lever 60 is pivoted to a projects from the lower end of the bearing element 76 that is connected to the side of the spring frame. Plates 78 are secured to the side of spring 72 and their adjacent ends are turned laterally into parallel relation to each other to provide armatures 79 for electro-magnet '80 that are supported in brackets 81 from the opposite sides of beam 5. Here it will be seen that when the magnets are energized they will attract their respective armatures and deflect the spring 72 to swing the screen in one direction, and when the magnets are denergized, the reaction of the spring will move the screen in the opposite direction. The present modification is distinguished from the ones preceding it by the curved formation of the spring 72 and its pivotal connections with the screen. The curved portions adjacent the outer ends of this spring lengthen and shorten very slightly as the screen reciprocates to compensate for the variations in distance between the fixed support of the spring and its outer ends that are confined to parallel courses.

Having thus described my invention, what I claim is 1. In apparatus of the character set forth, the combination of a supporting structure, a screen,.springs disposed transversely of the screen and sustained in spaced relation to each other by the supporting structure, bearing elements through which the screen is supported from the springs, and means for deflecting first one spring and then the other in opposite directions to positively move the screen both to and fro.

2. In apparatus of the character set forth, the combination of a supporting structure, a screen, a spring disposed transversely of the screen and sustained adjacent the center thereof by the supporting structure, bear ing elements disposed on opposite sides of the screen and through which the screen is supported from the ends of the spring, electromagnetic means for deflecting the ends of the spring, a circuit including said means, and means for periodically closing the circuit to intermittently energize the electromagnetic means.

3. In apparatus of the character set forth. the combination of a supporting structure. a screen, bearing elements carried by the screen, a spring disposed transversely of the screen and sustained by the supporting structure, a member applied to each end of the spring one part whereof is designed for cooperation with one of the bearing elements and another part of which constitutes an armature, an electromagnet disposed in operative relation to the latter part of said mem her, a circuit including the electromagnet, and means for periodically closing the circuit thereby to intermittently energize the electromagnet.

. the combination of a supporting structure, a 1

outer. end

circuit x-thereby 4. In apparatus of the character set forth, the combination of a supporting structure, a screen, a spring disposed transversely of said screen and sustained by the supporting structure, bearing elements carriedby the opposite sides of the screen, an L-shaped member applied to each end of the spring the outer end whereof is designed for cooperation with the bearing element occurring on the corresponding side of the screen, an elec tromagnet disposed in operative relation to? the laterally turned part of each member, a circuit including the electromagnet, and

means for periodically closing the circuit thereby to intermittently energize the mag-' net. I.

- 5. In apparatus of the character set forth, the combination of a supporting structure, a screen, bearing elements carried by-opposite sides of the screen, a spring-disposed transversely of the screen and sustained by the supporting structure, an L-shaped member applied to each end of the spring the whereof is designed for cooperation With the bearing element occurring on the. corresponding. side of the screen, the

lateral branches of the L-shaped members being substantially parallel to and spaced from. each other, and an electromagnet'disposed between. thelateral branches of'said members, a circuit including the electromagnets, and means for periodically closing the the electromagn'ets.

6. --I-n a' paratus of-the character setforth, the combination of a supporting structure, a screen, a curved spring disposed transversely-of the screen and sustained by the supporting structure, pivotal connections betweenthe. outer ends .of the spring and the screen, tand'means for moving the screen to and fro a e In apparatusof the character set forth,

screen, a curved spring disposed transversely of the screen andsustained by the supportingstructure, upwardly opening socket members carried by the ends of the spring, bear-..

to intermittently energize ing elements attached to the opposite sides of the screen and having parts occupying the socket, and means for moving the screen to and fro.

8. In apparatus of the character set forth,

the combination of a supporting structure,

a screen, a curved snrlng disposed transversely of and beneath the screenand sustained' by the supporting structure, up-

a'rdly opening socket memberscarried bythe ends of the spring, bearing elements attached to the opposite sides of the screenand' having parts occupying the socket, means.

for moving the screen to and fro, ings Within the bottoms of the sockets whereon the aforesaid parts rest, and packing elements between the bearing elements and members. i

- .9. In a paratus of the character-set forth,-

the combination of a supporting structure, a

10. In apparatus of the character set forth,

the combinationof a supporting structure, a

screen, a spring disposed transversely ofthe screen and sustained by the structure, a' lever pivotally su orted by the structure and one end Whereofbears upon one side of-the anelectromagnet d1sposed 1n opera--- spring,

ball 'beara circuit includingthe electm tiveprelationto the stem of said. lever,

circuit including the electromagnet,,and

means for periodically closing the. circuit thereby to .intermittently energize the';elec-.

tromagnet.

In. testimony tvhereof, I hereunto ailix my. J

signatureafax FRAN JDLRUBREGHTL Y 

